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However, Maidstone Prison staff hope new laws could stop the problem.

A Prison Service spokesman said: "As this report recognises, improvements have been made.

"But we must do more to tackle drugs in our prisons.

"That's why we've put a range of robust measures in place, including the use of search dogs and tough new laws which will see those who smuggle packages over prison walls, including new psychoactive substances, face up to two years in prison."

Maidstone is a category C prison which holds 600 inmates.

Alamy

Maidstone prison is solely for foreign prisoners with the IMB flagging 'great concern' about the use of Spice and other psychoactive substance among inmates

The IMB also found some issues flagged up by the previous report, were still persisting.

Around 12 to 15 inmates at any one time are remaining in prison after their sentences, because of issues with their deportations.

The report says this includes those who "are violent and likely to re-offend but may not be released into the community as there is no potential for deportation."

Dental care also remained a problem, with 130 inmates still on the waiting list for treatment.

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